you should summon more then ones per hour, when your are a summoner!
I am not realy playing summoner
its more of a unearth-spirit offering experiment, then a summoner
still, my trolling lvl45corpse unearth crit spectre seems to fit better in the build then most spectre builds I have seen.
it could be better if I get my heal from leech/regen/recharge or other forms instead of spirit offering, then I could use big level unearth for spectre's
for the moment they do fine:40%damage and life, but still crits, ranged, gets frenzy, follow, do job, interact with other 66.6zoo